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Performance improvement of amorphous indium-gallium-zinc oxide ReRAM with SiO2 inserting layer
Yanli Pei,Biaoren Mai,Xiaoke Zhang,Ruiqin Hu,Ya Li,Zimin Chen,Bingfeng Fan,Jun Liang,Gang Wang 한국물리학회 2015 Current Applied Physics Vol.15 No.4
In this study, the resistive switching performance of amorphous indiumegalliumezinc oxide (a-IGZO) resistive switching random-access memory (ReRAM) was improved by inserting a thin silicon oxide layer between silver (Ag) top electrode and a-IGZO resistive switching layer. Compared with the single a-IGZO layer structure, the SiO2/a-IGZO bi-layer structure exhibits the higher On/Off resistance ratio larger than 103, and the lower operation power using a smaller SET compliance current. In addition, good endurance and excellent retention characteristics were achieved. Furthermore, multilevel resistance states are obtained through adjusting SET compliance current and RESET stop voltage, which shows a promise for high-performance nonvolatile multilevel memory application.
Hydrogels with diffusion-facilitated porous network for improved adsorption performance
Yan-yan Pei,Dong-mei Guo,Qing-da An,Zuo-yi Xiao,Shangru Zhai,Bin Zhai 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.12
Porous alginate-based hydrogel beads (porous ABH) have been prepared through a facile and sustainable template-assisted method using nano-calcium carbonate and nano-CaCO3 as pore-directing agent for the efficient capture of methylene blue (MB). The materials were characterized by various techniques. The sorption capacities of ABH towards MB were compared with pure sodium alginate (ABH-1:0) in batch and fixed-bed column adsorption studies. The obtained adsorbent (ABH-1:3) has a higher BET surface area and a smaller average pore diameter. The maximum adsorption capacity of ABH-1:3 obtained from Langmuir model was as high as 1,426.0mg g1. The kinetics strictly followed pseudo-second order rate equation and the adsorption reaction was effectively facilitated, approximately 50minutes to achieve adsorption equilibrium, which was significantly shorter than that of ABH-1:0. The thermodynamic parameters revealed that the adsorption was spontaneous and exothermic. Thomas model fitted well with the breakthrough curves and could describe the dynamic behavior of the column. More significantly, the uptake capacity of ABH-1:3 was still higher than 75% of the maximum adsorption capacity even after ten cycles, indicating that this novel adsorbent can be a promising adsorptive material for removal of MB from aqueous solution under batch and continuous systems.
Practical method for determining load and resistance factors using third-moment transformation
Pei-Pei Li,Zhao-Hui Lu,Yan-Gang Zhao 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.80 No.2
Load and resistance factor design (LRFD) is a suitable format for the reliability-based limit state design of structures. It has been adopted in many countries, such as the United States, Europe, Canada, and Japan. Usually, the first-order reliability method (FORM) is used to estimate the load and resistance factors, but it requires the determination of design points and complicated double iterative computations. Therefore, FORM is not easy or practical for engineers to use. This paper presents a simple, accurate method to determine the load and resistance factors utilizing the third-moment transformation, which does not require derivative-based iterations and can estimate the load and resistance factors without using the distribution of random variables. In addition, the proposed method provides enough accurate results within a wide range of target reliability indices. Therefore, this method should be effective and convenient for calculating the load and resistance factors in actual practice. Five numerical examples illustrate the proposed method’s efficiency and accuracy; FORM provides a benchmark for comparison.
Zhang Pei-Pei,Liang Su-Xia,Wang Hua-Lun,Yang Kun,Nie Shao-Chen,Zhang Tong-Mei,Tian Yuan-Yuan,Xu Zhao-Yuan,Chen Wei,Yan Ying-Bin 한국통합생물학회 2021 Animal cells and systems Vol.25 No.5
The aim of this study was to compare the functional characteristics of mesenchymal stromal cells (MSCs) from a sheep model of traumatic temporomandibular joint (TMJ) fibrous and bony ankylosis. A sheep model of bilateral TMJ trauma-induced fibrous ankylosis on one side and bony ankylosis on the contralateral side was used. MSCs from fibrous ankylosed callus (FAMSCs) or bony ankylosed callus (BA-MSCs) at weeks 1, 2, 4, and 8 after surgery were isolated and cultured. MSCs derived from the bone marrow of the mandibular condyle (BM-MSCs) were used as controls. The MSCs from the different sources were characterized morphologically, phenotypically, and functionally. Adherence and trilineage differentiation potential were presented in the ovine MSCs. These cell populations highly positively expressed MSC-associated specific markers, namely CD29, CD44, and CD166, but lacked CD31 and CD45 expressions. The BA-MSCs had higher clonogenic and proliferative potentials than the FA-MSCs. The BA-MSCs also showed higher osteogenic and chondrogenic potentials, but lower adipogenic capacity than the FA-MSCs. In addition, the BA-MSCs demonstrated higher chondrogenic, but lower osteogenic capacity than the BM-MSCs. Our study suggests that inhibition of the osteogenic and chondrogenic differentiations of MSCs might be a promising strategy for preventing bony ankylosis in the future.
Influence of Curcumin on HOTAIR-Mediated Migration of Human Renal Cell Carcinoma Cells
Pei, Chang-Song,Wu, Hong-Yan,Fan, Fan-Tian,Wu, Yi,Shen, Cun-Si,Pan, Li-Qun Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.10
Background: This study investigated the influence of curcumin on HOX transcript antisense RNA (HOTAIR)-mediated migration of cultured renal cell carcinoma (RCC) cells. Materials and Methods: Five RCC cell lines (769-P, 769-P-vector, 769-P-HOTAIR, 786-0, and Kert-3 ) were maintained in vitro. The expression of HOTAIR mRNA was determined by quantitative real-time PCR and cell migration was measured by transwell migration assay. The effects of different concentrations of curcumin (0 to $80{\mu}mol/L$) on cell proliferation was determined by the CCK-8 assay and influence of non-toxic levels (0 to $10{\mu}M$) on the migration of RCC cells was also determined. Results: Comparison of the 5 cell lines indicated a correlation between HOTAIR mRNA expression and cell migration. In particular, the migration of 769-P-HOTAIR cells was significantly higher than that of 769-P-vector cells. Curcumin at $2.5-10{\mu}M$ had no evident toxicity against RCC cells, but inhibited cell migration in a concentration-dependent manner. Conclusions: HOTAIR expression is correlated with the migration of RCC cells, and HOTAIR may be involved in the curcumin-induced inhibition of RCC metastasis.
Yan, Zheng-Fei,Trinh, Huan,Moya, Gabriela,Lin, Pei,Li, Chang-Tian,Kook, MooChang,Yi, Tae-Hoo Microbiology Society 2017 International journal of systematic and evolutiona Vol.67 No.10
<P>A Gram-negative, aerobic, non-motile, long rods or coccoid without flagellum strain, designated THG-YS3.2.7(T), was isolated from therhizosphere soil of a Mugunghwa flower collected from Kyung Hee University, Yongin, South Korea. Growth occurred at 10-40 degrees C (optimum 28-37 degrees C), at pH 6-8 (optimum 7) and at 0-5% NaCl (optimum 1 %). The predominant ubiquinone was ubiquinone 8 (Q-8). The major cellular fatty acids were C-10 : 0, C-10 : 0 3OH, C-16 : 0, C-17 : 0, C-17 : 0 cyclo, C-18 : 0, C(18 : 3 omega)6c (6,9,12), summed feature 3 (C-16 (: 1)omega 7c and/or C-16 : 1 omega 6c) and summed feature 8 (C-18 : 1 omega 7c and/or C-18 : 1 omega 6c). The major polar lipids were diphosphatidylglycerol (DPG), phosphatidylglycerol (PG), phosphatidylethanolamine (PE), phosphatidylcholine (PC). The DNA G+C content of strain THG-YS3.2.7(T) was 69.4 mol%. Based on 16S rRNA gene sequence analysis, the nearest phylogenetic neighbours of strain THG-YS3.2.7(T) were identified as Ramlibacter henchirensis DSM 14656(T) (97.92 %), Ramlibacter tataouinensis DSM 14655(T) (97.90 %), Ramlibacter solisilvae KACC 17567(T) (97.04 %). DNA-DNA hybridization values between strain THG-YS3.2.7(T) and R. henchirensis DSM 14656(T), R. tataouinensis DSM 14655(T), R. solisilvae KACC 17567(T) were 32.5 +/- 1.5, 43.1 +/- 1.1, 42.8 +/- 1.1 %, respectively. On the basis of the phylogenetic analysis, chemotaxonomic data, physiological characteristics and DNA-DNA hybridization data, strain THG-YS3.2.7(T) represent a novel species of the genus Ramlibacter, for which the name Ramlibacter rhizophilus sp. nov. is proposed. The type strain is THG-YS3.2.7(T) (= KCTC 52083(T) = CCTCC AB 2015357(T)).</P>
Aeromicrobium halotolerans sp. nov., isolated from desert soil sample
Yan, Zheng-Fei,Lin, Pei,Chu, Xiao,Kook, MooChang,Li, Chang-Tian,Yi, Tae-Hoo Springer-Verlag 2016 Archives of microbiology Vol.198 No.5
<P>A Gram-positive, aerobic, and non-motile, rod-shaped actinomycete strain, designated YIM Y47(T), was isolated from soils collected from Turpan desert, China, and subjected to a polyphasic taxonomic study. Phylogenetic analysis indicated that strain YIM Y47(T) belonged to the genus Aeromicrobium. YIM Y47(T) shared highest 16S rRNA gene sequence similarities with Aeromicrobium massiliense JC14(T) (96.47 %). Growth occurs at 20-45 A degrees C (optimum at 30 A degrees C), pH 6.0-8.0 (optimum at pH 7.0), and salinities of 0-7.0 % NaCl (optimum at 4.0 %). The strain YIM Y47(T) exhibits chemotaxonomic features with menaquinone-7 (MK-7) as the predominant quinone, C-16:0, C-18:1 omega 9c and 10-methyl C-18:0 (> 10 %) as major fatty acids. The cell-wall peptidoglycan of strain YIM Y47(T) contained ll-diaminopimelic acid as the diagnostic diamino acid. The polar lipids were found to consist of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol, and unknown phospholipids. The G+C content of the genomic DNA of strain YIM Y47(T) was found to be 44.7 mol%. On the basis of phylogenetic analyses and phenotypic data, it is proposed that strain YIM Y47(T) should be classified as representing a novel species of the genus Aeromicrobium, with the name Aeromicrobium halotolerans sp. nov. The type strain is YIM Y47(T) (=KCTC 39113(T)=CGMCC 1.15063(T)=DSM 29939(T)=JCM 30627(T)).</P>